.drag{
    width: 300px;
    height: 40px;
    line-height: 40px;
    background-color: #e8e8e8;
    position: relative;
    margin:0 auto;
}
.bg{
    width:40px;
    height: 100%;
    position: absolute;
    background-color: #75CDF9;
}
.text{
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    user-select: none;
}
.btn{
    width:40px;
    height: 38px;
    position: absolute;
    border:1px solid #ccc;
    cursor: move;
    font-family: "宋体";
    text-align: center;
    background-color: #fff;
    user-select: none;
    color:#666;
}